TY - JOUR
T1 - Barely visible impact damage assessment in laminated composites using acoustic emission
AU - Saeedifar, Milad
AU - Najafabadi, Mehdi Ahmadi
AU - Zarouchas, Dimitrios
AU - Toudeshky, Hossein Hosseini
AU - Jalalvand, Meisam
PY - 2018/11/1
Y1 - 2018/11/1
N2 - Despite the key advantages of Fiber Reinforced Polymer (FRP) composites, they are susceptible to Barely Visible Impact Damage (BVID) under transverse loadings. This study investigates BVID in two quasi-isotropic carbon/epoxy laminates under quasi-static indentation and Low-Velocity Impact (LVI) loadings using Acoustic Emission (AE). First, the evolution of interlaminar and intralaminar damages is studied by analyzing the AE signals of the indentation test using b-value and sentry function methods. Then, the specimens are subjected to the LVI loading and the induced damages are compared with the indentation test and the percentage of each damage mechanism is calculated using Wavelet Packet Transform (WPT). In consistent with the mechanical data, ultrasonic C-scan and digital camera images of the specimens, the AE results show a considerable similarity between the induced BVID under quasi-static indentation and LVI tests. Finally, the obtained results show that AE is a powerful tool to study BVID in laminated composites under quasi-static and dynamic transverse loadings.
AB - Despite the key advantages of Fiber Reinforced Polymer (FRP) composites, they are susceptible to Barely Visible Impact Damage (BVID) under transverse loadings. This study investigates BVID in two quasi-isotropic carbon/epoxy laminates under quasi-static indentation and Low-Velocity Impact (LVI) loadings using Acoustic Emission (AE). First, the evolution of interlaminar and intralaminar damages is studied by analyzing the AE signals of the indentation test using b-value and sentry function methods. Then, the specimens are subjected to the LVI loading and the induced damages are compared with the indentation test and the percentage of each damage mechanism is calculated using Wavelet Packet Transform (WPT). In consistent with the mechanical data, ultrasonic C-scan and digital camera images of the specimens, the AE results show a considerable similarity between the induced BVID under quasi-static indentation and LVI tests. Finally, the obtained results show that AE is a powerful tool to study BVID in laminated composites under quasi-static and dynamic transverse loadings.
KW - acoustic emission
KW - B-value
KW - barely visible impact damage
KW - indentation
KW - laminated composites
KW - low-velocity impact
KW - sentry function
KW - wavelet packet transform
UR - http://www.scopus.com/inward/record.url?scp=85049743161&partnerID=8YFLogxK
U2 - 10.1016/j.compositesb.2018.07.016
DO - 10.1016/j.compositesb.2018.07.016
M3 - Article
AN - SCOPUS:85049743161
VL - 152
SP - 180
EP - 192
JO - Composites Part B: Engineering
JF - Composites Part B: Engineering
SN - 1359-8368
ER -